A bash script to fix the grub menu.
Usage:
Simply run the script:
sudo ./grubfixIt will guide you step by step:
**********************************************************
Please choose the device where your system is installed.
A star (*) sign after the device id means it's bootable
It is not necessary for a system partition to be bootable
Be careful. We need the device id where the filesystem
resides, not where it is booted from.
**********************************************************
1) /dev/sdb3 148510720 206970879 58460160 27.9G Linux filesystem
2) /dev/sdb4 206970880 264634367 57663488 27.5G Linux filesystem
3) /dev/sdb6 383746048 500103167 116357120 55.5G Linux filesystem
4) exit
Choose a device (#?): 2
*** you have chosen: /dev/sdb4
*** Giving more info for confirmation
*** 'fdisk -l /dev/sdb4' says:
Disk /dev/sdb4: 27.5 GiB, 29523705856 bytes, 57663488 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
*** 'blkid /dev/sdb4' says:
/dev/sdb4: UUID="c0664c62-699d-4a8e-ae2f-81ee87975527" TYPE="ext4" PARTLABEL="Basic data partition" PARTUUID="6c56a7a0-b9b0-01d4-d043-2830d85cea00"
=== Please confirm (Y/n)?: y
*** /dev/sdb4 confirmed...
***********************************************************
Please choose the uefi boot device.
Be careful, we need the device id where it is booted from,
not where the root filesystem resides.
***********************************************************
1) /dev/sda1 2048 1333247 1331200 650M EFI System
2) /dev/sdb1 2048 1333247 1331200 650M EFI System
3) No uefi
4) exit
Choose a efi device (#?): 1
*** you have chosen: /dev/sda1
*** Giving more info for confirmation
Partition 1 does not start on physical sector boundary.
Partition 2 does not start on physical sector boundary.
Partition 3 does not start on physical sector boundary.
*** 'fdisk -l /dev/sda1' says:
Disk /dev/sda1: 650 MiB, 681574400 bytes, 1331200 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x69737369
Device Boot Start End Sectors Size Id Type
/dev/sda1p1 1869771365 2038460886 168689522 80.4G 69 unknown
/dev/sda1p2 1701519481 3571400945 1869881465 891.6G 73 unknown
/dev/sda1p3 2573 2573 0 0B 74 unknown
/dev/sda1p4 2885681152 2885733566 52415 25.6M 0 Empty
Partition table entries are not in disk order.
*** 'blkid /dev/sda1' says:
/dev/sda1: LABEL="ESP" UUID="9382-8550" TYPE="vfat" PARTLABEL="Basic data partition" PARTUUID="93828d50-bca4-01d4-a842-c149525eea00"
=== Please confirm (Y/n)?: y
*** /dev/sda1 confirmed...
*** mounted /dev/sdb4 in /mnt
*** mounted /dev in /mnt/dev
*** mounted /dev/pts in /mnt/dev/pts
*** mounted /proc in /mnt/proc
*** mounted /sys in /mnt/sys
*** chroot: running mount /dev/sda1 /boot/efi ...
*** chroot: running grub-install ...
Installing for x86_64-efi platform.
Installation finished. No error reported.
*** chroot: running update-grub ...
Generating grub configuration file ...
Found theme: /usr/share/grub/themes/manjaro/theme.txt
Found linux image: /boot/vmlinuz-4.19-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-4.19-x86_64.img
Found initrd fallback image: /boot/initramfs-4.19-x86_64-fallback.img
Found Ubuntu 18.04.2 LTS (18.04) on /dev/sdb3
Found memtest86+ image: /boot/memtest86+/memtest.bin
done
*** chroot: running umount /boot/efi
*** unmounted /mnt/sys
*** unmounted /mnt/proc
*** unmounted /mnt/dev/pts
*** unmounted /mnt/dev
*** unmounted /mnt
If it's more complex than that, then this script also allows you to open a chroot terminal on your target system, run it with -co option:
sudo ./grubfix -coIn chroot only mode, it will not do any additional task other than opening a terminal window with chroot. You can then use that terminal to configure your target system and install or modify pacakges to correct problems.